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321 SS and other header observations
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Posted by Jeff in ATL (more from Jeff in ATL) on Thu, 14 Jul 2005 07:14:43 Share Post by Email
In Reply to: well flanges are allmost allways 304 & a pic :-), jak [Profile/Gallery] , Wed, 13 Jul 2005 17:37:35
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"321 stainless steel tubing is one of the most desirable materials for exhaust systems because of its excellent resistance to fatigue and cracking at elevated temperatures. It is usually the material of choice for high temperature turbo applications."

"304 is the most inexpensive and available stainless in the 300 series. It is suitable for normally-aspirated header applications. It does not have the high temperature fatigue resistance that 321 does, but is considerably less costly and much more available."

I suppose it will come down to the price of your header, if you have incorporated equal lengths of tubings for each cylindar(which I can't tell fro the picture iof that is the case and if there are no cheated radius bends involved. Cylindar#3 looks like a cheated radius where it connects to the colletor.

Many headers are built with a cheated radius angled downward at the flange, away from port flow, causing a disruption of exhaust flow and a loss of power. Be sure your header design does not make this mistake! Check that header bolts can be installed and removed at this time with wrench or socket clearance, and make sure spark plugs and socket can fit around your tubes.



posted by 208.235.174...

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